[pure-silver] Re: Formula needed

lets see.
I had to invent this on the fly.  Where Ds =subject distance, Df=focus
distance, and Fl=,well, Fl,

Ds= 2Fl squared/Df-Fl.  I get 1120mm.

There is the slightest chance I'm right.  it seems reasonable.
----- Original Message -----
From: "Stein" <rstein@xxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, September 26, 2004 3:51 PM
Subject: [pure-silver] Formula needed


> Dear Friends,
>      I am currently constructing a camera and need to know a formula for
calculating the in-focus point for the main subjects. The camera has a fixed
extension of 466 mm from the film plane to the lens mount. If I mount a 300
mm len with the nodal point just about at that 466 mm point, what will be
the distance between the lens and the in-focus subject plane?
>
>     I know I have the formula somewhere but cannot find it.
>
>      Thanks in advance.
>
>      Uncle Dick
>
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